However, your Mac will not boot into OS X Lion and earlier with 64 GB of RAM. But was 32 GB the actual limit? Something seemed off, and indeed it was. Apple claims this is 16 GB, but many users found this wasn’t the case, as reports surfaced over time about 32 GB working in this Mac Pro model.

It required jumping through some hoops to find an answer. It’s easy to ask the question, but hard to find an answer. In this article, I will explain my research and the type of RAM I used, should you decide to do what I’ve done.

This is a dilemma which faced me several times as I pushed the envelope, took the risk, and got away with jamming 64 GB of RAM right into my Mac Pro 2,1. Sometimes we think too much into whether we can – so much so that we don’t question whether we should.